3. A physical education teacher wanted to know the effects of various activity levels on body composition. She surveyed her physical education classes and categorized 30 students into ve activity levels based on the amount of daily exercise in which the students participated: inactive, semiactive, normal, active, and very active. She measured percent body fat values using skinfold calipers on all subjects with the following results. Inactive Semiactive Norma] Active Very active 30.2 29.4 22.9 17.6 10.9 29.6 1?.6 25.4 13.4 13."? 35.2 26.4 19.6 20.3 12.8 19.1 25.3 18.7 19.6 14.7r 26.3 22.5 21.8 15.1 9.3 22.4 28.6 24.9 10.7 12.".l Use a computer to solve this problem. a. What is the independent variable in this study? What Is the dependent variable? b. What are the means and standard deviations for each group? 0. Does a significant difference exist among any of the groups? What is the probability value for the test of the null hypothesis? d. Create a mean difference table and indicate the signicance of the differences among the groups using Tukey's HSD. Review the hint given in problem 1 for help with setting up the database. The database in problem 3 will be similar to that in problem 1, but column 1 will have five groups (designated by numbers 1, 2, 3, 4, or 5) and percent body fat values will be in column 2